Chair.



PATE'NTBD 00m. 6, 1903.

CHAIR. urucnmn nun 001 .25. 1901. xmmwnn MAR. as, 1903.

H0 MODEL.

WI TNE SSE S m: mums PETERS ca. Mom-u mo wasnmsros u c.

UNITED STATES Patented October 6, 1903.

FFlCE.

PATENT CHAIR.

SPECIFICATION forming part of Letters Patent No. 740,825, dated October 6, 19Q3. Application filed October 25,1901. Renewed March 23. 1903. I Serial No. 149,206. (No model.)

T all whom it may concern.-

Be it known that 1, OLIVER CHARLES D'on- NEY, a citizen of the United States, and a resident of Allentown, in the county of Lehigh and State of Pennsylvania, have invented a new and Improved Chair, of which the follow ing is a full, clear, and exact description;

This invention relates to improvements in chairs, particularly adapted for use in schools,

theaters, public halls, and the like; and the object-is to provide a chair of simple construction, having no parts liable to get out of order or break and so arranged that the seat and back may be easily-and quickly adjusted as desired.

I will describe a chair embodying my invention and then point out the novel fea tures in the appended claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the figures.

Figure 1 is a side elevation of a chair embodying my invention. Fig. 2 is a front view thereof with the seat turned up. Fig. 3 is a section on the line 3 3 of Fig. 1.

Referring to the drawings, designates the tubular base-post, which may be secured to a floor by means of bolts or other suitable devices. Adjustable vertically in this post 10 is the seat-carrying standard 11. This standard 11 is made in the form of a screw and engages in a sleeve or nut 12, arranged in a boxing 13 on the upper end of the post 10. The lower end of the'sleeve or nut 12 is provided with a miter-gear 14, engaging with a miter-pinion 15, the shaft 16 of which has a bearing in a wall of the casing, and the outer end of this shaft is made angular in cross-section to receive a key for the purpose of rotating it. the standard 11 may be raised or lowered.

To insure this movement, however, the standard must be held from rotary motion. Therefore I have provided it with a longitudinal channel 18, in which a block 19 engages. This block 19 has swivel connection with a bolt 20, movable in the upper portion of the casing 13. Swiveled on the upper end of the standard 11 is a cross-head 21, supporting the seat 22. This cross-head 21 is provided with a socket portion 23, into which the upper end Obviously by rotating the pinion of the standard 11 passes, and the end of the standard within the socket is provided with an annular channel 24, in which the end of a screw-bolt25 engages.

The seat 22 is secured to castings or arms 26, which for the purpose of strength are provided on the under side with longitudinal ribs 27. These castings or arms are mounted to swing on reduced portions 28 of'the crosshead 21. Lugs 29, attached to the reduced portions 28, pass into an nnlarly-disposed slots 30 in the portions of the arms 26 that surround the cross-head. The lower end walls of these slots 30 by engaging with the lugs 29 will prevent the seat from swinging too far rearward when moved upward, as indicated in dotted lines in Fig. 1 and in full lines in Fig. 2, and the upper end walls of said slot by engaging with the lugs will prevent the seat from swinging too'far downward.

Extended downward and rearward from the cross-head 21 are arms 31, and supported at the rear ends of these arms 31 is a rod 32. On this rod 32 is mounted to swing a backsupporting frame comprising the arms 33, connected at the rear end byra' cross-bar 34, from which an arm 35 extends. The backpost 36 is pivotaliy connected to the upwardly-extended portion 37 of the arm 35.

As here shown, the back-post 36 is bifurcated at its lower end, so as to engage on opposite sides of the arm, and it is secured in its adjusted position by means of a bolt 38, passing ,through the bifurcated portions of the post and through an arc-slot 39 in said arm 35. The bolt is engaged at one end by a set-nut lO.

Attached to the upper end of the back-post is a curved back-rest 41. This back-rest is adjustable toward and from the back-post vertically thereof and as to its angle with relation to the back-post. To cause these several adjustments, arms 42 are attached to-the For the ease and comfort of a person sitting in the chair the back is designed to have a yielding motion with relation to the seat. For this purpose I provide a spring 45, which has its body portion coiled in opposite directions around sleeves 46 on the rod 32, and the extreme ends of these coiled portions are engaged with blocks 47, attached to the arms 31, while the central portion of the spring is extended rearward and engages in an annular channel formed in an interiorly-threaded block 48, engaged by a set-screw 49, the upper end of said set-screw 49 being engaged with the arm 35 at its junction with the crossbar 34. By manipulating this screw 49 the tension of the spring may be regulated.

The forward ends of the arms 33 are pro- Vided with vertically-disposed portions 50, which at the upper ends are turned inward, as at 51, and at the lower ends are turned inward, as at 52, these inwardly-turned portions being designed to engage, respectively, with the upper and lower portions of the arms 31 to limit the swinging movement of the back-supporting frame relatively to the said arms. The standard 11 may be held in its adjusted position or locked by forcing the 2. A chair comprising a standard, a crosshead on the standard, arms extended rearward from the cross-head, a back-supporting frame supported by the arms and arranged to swing, stops on said frame for engaging the upper and lower sides of the arms, the said frame consisting of arms having connection at the rear ends, an arm extended from the connection and provided with a slot, an upwardly-extended portion on said last-named frame, a back supported on said slotted arm,

a bolt passing through the slot and through a portion of the back for holding the back as adjusted, a spring surrounding said rod and having its free ends engaged with the firstnamed arms, and an adjusting-screw with which the central portion of said spring e'ngages, substantially as specified.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

OLIVER CHARLES DORNEY.

Witnesses:

EDWARD RUHE, WILLIAM F. Bone. 

